CN106311762A - Load distribution method improving rolling stability of hot-rolled thin strip - Google Patents
Load distribution method improving rolling stability of hot-rolled thin strip Download PDFInfo
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- CN106311762A CN106311762A CN201610729966.8A CN201610729966A CN106311762A CN 106311762 A CN106311762 A CN 106311762A CN 201610729966 A CN201610729966 A CN 201610729966A CN 106311762 A CN106311762 A CN 106311762A
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- reduction ratio
- load distribution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/12—Rolling load or rolling pressure; roll force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2271/00—Mill stand parameters
- B21B2271/02—Roll gap, screw-down position, draft position
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention provides a load distribution method improving rolling stability of a hot-rolled thin strip, relates to a control method suitable for rolling the hot-rolled thin strip and aims at providing the load distribution method improving the rolling stability of the hot-rolled thin strip. By means of the method, wide-range fluctuation of the load of a rolling mill caused by temperature fluctuation of a finish rolling inlet can be avoided, the rolling accidents are obviously reduced, and the rolling stability is greatly improved. The load distribution method improving the rolling stability of the hot-rolled thin strip includes the following steps that when the hot-rolled thin strip is rolled and a first piece of thin strip steel is rolled, distribution is performed according to a universal load distribution method; and when a second piece of strip steel and later same-steel-grade and same-specification strip steel are rolled, the downward-pressing rates of an F1 rolling mill, an F2 rolling mill and an F7 rolling mill are immobilized, the rolling force rates of rolling mills ranging from F3 to F6 are corrected, and the downward-pressing rates of the rolling mills ranging from F3 to F6 are made to be kept relatively stabilized.
Description
Technical field
The present invention relates to field of metallurgy, particularly relate to a kind of control method being applicable to hot rolled thin strip rolling.
Background technology
In metallurgy industry, generally comprising mm finishing mill unit in SPHC technique, mm finishing mill unit is the equipment of most critical, shadow
Ring the various Con trolling index of finished product.Finishing mill generally comprises working roll, supports roller, roll adjusting device, guide and guards, kink
Deng.
Hot tandem distributes the principle of each frame drafts: usually make full use of the advantage of high temperature, pressure
Amount concentrates on front several milling train as far as possible.For thin slab product, in order to ensure template, thickness and precision and table on rear several milling trains
Face quality, drafts is gradually reduced.Specifically it is allocated as follows:
(1) first milling train is in view of the fluctuation of made-up belt thickness, and difficulty, drafts may be caused should to be slightly less than to nipping
Heavy reduction；
(2) second and third gives heavy reduction as far as possible, to make full use of capacity of equipment；
(3) the most each rolling mill is gradually reduced drafts, general 10～about 15% to the last, to ensure plate
Shape, thickness and precision and performance quality.
The purpose that hot continuous rolling plate strip rolling process controls is to realize rolling process optimization, with mathematical model in line computation
Control parameter and self adaptation.The core participating in calculating is the distribution of each rolling mill screwdown amount, i.e. sharing of load.The load used both at home and abroad
Distribution method has reduction ratio, roll-force, three kinds of partition coefficient methods of power, and conventional is reduction ratio partition coefficient method.Mm finishing mill unit
The whether reasonable ability to bear directly affecting whole mm finishing mill unit load of each mill load distribution and belt steel rolling process
Stability, and directly affect a series of quality index such as Strip Shape Control.
When rolling hot-rolling strip, owing to the fluctuation of entry temperature at finishing causes the fluctuation of mill load, in production
Frequently occur heap steel accident, whipping accident etc., significantly impact the stability of rolling, reduce production operational availability and lumber recovery,
Cause company's tremendous economic loss.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of load distribution method improving hot rolled thin strip rolling stability,
The method is it can be avoided that the fluctuating widely of mill load that cause of entry temperature at finishing fluctuation, hence it is evident that decrease rolling accident
Occur, greatly improve the stability of rolling.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, comprises the steps:
When rolling hot-rolling strip, during first piece of thin gauge strip of rolling, carry out point according to general load distribution method
Join；
When rolling second piece and the most same steel grade, same specification strip steel, the reduction ratio of solidification F1, F2 and F7 milling train, revise
The roll-force ratio of F3～F6 milling train so that the reduction ratio of F3～F6 milling train keeps relative stability.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, wherein said general load distribution method
As follows:
(1) first milling train F1 is in view of the fluctuation of made-up belt thickness, and difficulty, drafts may be caused to be slightly less than to nipping
Maximum reduction,
(2) second rolling mill F2 and the 3rd rolling mill F3 give the biggest drafts, to make full use of capacity of equipment,
(3) the most each rolling mill F4～F7 is gradually reduced drafts, the drafts of the last rolling mill F7 control 10～
15%, to ensure plate shape, thickness and precision and performance quality.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, the reduction ratio of wherein said F1, F2 milling train
Sum accounts for more than the 60% of finish rolling region total reduction, and when the reduction ratio of F1, F2 milling train is fixed, strip steel state end to end will phase
To stable.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, wherein for identical steel grade and the band of specification
Steel, revises the roll-force ratio of described F3-F6 milling train, within making the reduction ratio rate of change of F3-F6 milling train be maintained at 5%.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, thickness≤2.0 of wherein said strip steel.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, wherein at rolling second piece and the most same steel
When kind, same specification strip steel, solidifying the reduction ratio of described F1 milling train, the reduction ratio of described F1 milling train is maintained between 46～52%.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, wherein at rolling second piece and the most same steel
Kind, same specification strip steel time, solidify the reduction ratio of described F2 milling train, the reduction ratio of described F2 milling train be maintained at 48～53.5% it
Between.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, wherein at rolling second piece and the most same steel
When kind, same specification strip steel, solidifying the reduction ratio of described F7 milling train, the reduction ratio of described F7 milling train is maintained between 10～15%,
The roll-force making the F7 milling train after solidifying reduction ratio maintains 1000t～1300t.
The present invention improves the load distribution method of hot rolled thin strip rolling stability when rolling hot-rolling strip, rolls first piece
During thin gauge strip, it is allocated according to general load distribution method, at rolling second piece and the most same steel grade, same specification band
During steel, the reduction ratio of solidification F1, F2, F7 milling train, revise the roll-force ratio of F3-F6 milling train so that the reduction ratio of F3-F6 milling train
Keep relative stability, it is to avoid the fluctuation of the mill load that entry temperature at finishing fluctuation causes, hence it is evident that decrease rolling accident
Generation, greatly improve the stability of rolling.
Detailed description of the invention
The present invention improves the load distribution method of hot rolled thin strip rolling stability and comprises the steps:
When rolling hot-rolling strip, during first piece of thin gauge strip of rolling, carry out point according to general load distribution method
Join；
When rolling second piece and the most same steel grade, same specification strip steel, the reduction ratio of solidification F1, F2 and F7 milling train, revise
The roll-force ratio of F3～F6 milling train so that the reduction ratio of F3～F6 milling train keeps relative stability.
Reduction ratio is (inlet of rolling mill thickness-milling train exit thickness)/inlet of rolling mill thickness, and roll-force ratio is with F1 milling train
Roll-force on the basis of, other mill rolling forces are its percentage ratio.When rolling hot-rolling strip, the reduction ratio of F1, F2 milling train
Sum accounts for more than the 60% of finish rolling region total reduction, and when the reduction ratio of F1, F2 milling train is fixed, strip steel state end to end will phase
To stable.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, wherein said general load distribution method
As follows:
(1) first milling train F1 is in view of the fluctuation of made-up belt thickness, and difficulty, drafts may be caused to be slightly less than to nipping
Maximum reduction,
(2) second rolling mill F2 and the 3rd rolling mill F3 give the biggest drafts, to make full use of capacity of equipment,
(3) the most each rolling mill F4～F7 is gradually reduced drafts, the drafts of the last rolling mill F7 control 10～
15%, to ensure plate shape, thickness and precision and performance quality.
Above-mentioned general load distribution method is prior art, and it is usually used as the conventional side adjusting mill load distribution
Method.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, wherein for identical steel grade and the band of specification
Steel, revises the roll-force ratio of described F3-F6 milling train, within making the reduction ratio rate of change of F3-F6 milling train be maintained at 5%.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, thickness≤2.0 of wherein said strip steel.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, wherein at rolling second piece and the most same steel
When kind, same specification strip steel, solidifying the reduction ratio of described F1 milling train, the reduction ratio of described F1 milling train is maintained between 46～52%.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, wherein at rolling second piece and the most same steel
Kind, same specification strip steel time, solidify the reduction ratio of described F2 milling train, the reduction ratio of described F2 milling train be maintained at 48～53.5% it
Between.
The present invention improves the load distribution method of hot rolled thin strip rolling stability, wherein at rolling second piece and the most same steel
When kind, same specification strip steel, solidifying the reduction ratio of described F7 milling train, the reduction ratio of described F7 milling train is maintained between 10～15%,
The roll-force making the F7 milling train after solidifying reduction ratio maintains 1000t～1300t.
Below by specific embodiment, the present invention is improved the load distribution method work of hot rolled thin strip rolling stability in detail
Explanation.
Embodiment one
The present invention improves the load distribution method of hot rolled thin strip rolling stability and comprises the steps:
Step S1: when rolling hot-rolling strip first piece of strip steel of SPA-H 1.55mm, according to general load distribution method
Be allocated, rolling second piece and when the most same steel grade, same specification strip steel, solidify respectively in second control system F1, F2,
The reduction ratio of F7 milling train is 50%, 52%, 10%.
Step S2: revise the roll-force ratio of F3-F6 milling train so that the reduction ratio of F3-F6 milling train keeps relative stability.F3
The reduction ratio of milling train be 40% (1+/-5%), the reduction ratio of F4 milling train be that 32% (1+/-5%), the reduction ratio of F5 milling train are
26% (1+/-5%), the reduction ratio of F6 milling train are 21% (1+/-5%).
The reduction ratio of above-mentioned F3 milling train is the span that 40% (1+/-5%) refers to reduction ratio, i.e. the pressure of F3 milling train
Lower rate span is 40% (1-5%)～40% (1+5%), wherein 40% (1-5%)=40%-40% × 5%=38%,
40% (1+5%)=40%+40% × 5%=42%, the span of the reduction ratio that thus can obtain F3 milling train be 38%～
42%.The reduction ratio of F4-F6 milling train given above is also same algorithm, after being computed, and the reduction ratio value model of F4 milling train
Enclosing is 30.4%～33.6%, and the reduction ratio span of F5 milling train is 24.7%～27.3%, the reduction ratio value of F6 milling train
Scope is 19.95%～22.05%.
After using said method, hot rolled thin strip is in the operation of rolling, and threading and throwing steel rolling are stable, do not occur due to load
The rolling accident that unreasonable distribution causes.
Embodiment two
The present invention improves the load distribution method of hot rolled thin strip rolling stability and comprises the steps:
Step S1: when rolling hot-rolling first piece of strip steel of strip SDC031.58mm, enter according to general load distribution method
Row distribution, when rolling second piece and the most same steel grade, same specification strip steel, solidifies F1, F2, F7 in second control system respectively
The reduction ratio of milling train is 47%, 49%, 15%.
Step S2: revise the roll-force ratio of F3-F6 milling train so that the reduction ratio of F3-F6 milling train keeps relative stability.F3
The reduction ratio of milling train be 41% (1+/-5%), the reduction ratio of F4 milling train be that 35% (1+/-5%), the reduction ratio of F5 milling train are
28% (1+/-5%), the reduction ratio of F6 milling train are 23% (1+/-5%).
The reduction ratio of above-mentioned F3 milling train is the span that 41% (1+/-5%) refers to reduction ratio, i.e. the pressure of F3 milling train
Lower rate span is 41% (1-5%)～41% (1+5%), wherein 41% (1-5%)=41%-41% × 5%=
38.95%, 41% (1+5%)=41%+41% × 5%=43.05%, thus can obtain the span of the reduction ratio of F3 milling train
It is 38.95%～43.05%.The reduction ratio of F4-F6 milling train given above is also same algorithm, after being computed, and F4 milling train
Reduction ratio span be 33.25%～36.75%, the reduction ratio span of F5 milling train is 26.6%～29.4%, F6
The reduction ratio span of milling train is 21.85%～24.15%.
After using said method, hot rolled thin strip is in the operation of rolling, and threading and throwing steel rolling are stable, do not occur due to load
The rolling accident that unreasonable distribution causes.
Embodiment three
The present invention improves the load distribution method of hot rolled thin strip rolling stability and comprises the steps:
Step S1: when rolling hot-rolling first piece of strip steel of strip SAE10052.0mm, according to general load distribution method
Be allocated, rolling second piece and when the most same steel grade, same specification strip steel, solidify respectively in second control system F1, F2,
The reduction ratio of F7 milling train is 46%, 48%, 13%.
Step S2: revise the roll-force ratio of F3-F6 milling train so that the reduction ratio of F3-F6 milling train keeps relative stability.F3
The reduction ratio of milling train be 41% (1+/-5%), the reduction ratio of F4 milling train be that 34% (1+/-5%), the reduction ratio of F5 milling train are
25% (1+/-5%), the reduction ratio of F6 milling train are 22% (1+/-5%).
The reduction ratio of above-mentioned F3 milling train is the span that 41% (1+/-5%) refers to reduction ratio, i.e. the pressure of F3 milling train
Lower rate span is 41% (1-5%)～41% (1+5%), wherein 41% (1-5%)=41%-41% × 5%=
38.95%, 41% (1+5%)=41%+41% × 5%=43.05%, thus can obtain the span of the reduction ratio of F3 milling train
It is 38.95%～43.05%.The reduction ratio of F4-F6 milling train given above is also same algorithm, after being computed, and F4 milling train
Reduction ratio span be 32.3%～35.7%, the reduction ratio span of F5 milling train is 23.75%～26.25%, F6
The reduction ratio span of milling train is 20.9%～23.1%.
After using said method, hot rolled thin strip is in the operation of rolling, and threading and throwing steel rolling are stable, do not occur due to load
The rolling accident that unreasonable distribution causes.
The present invention at least has the following technical effect that or advantage: (1) present invention solidify in second control system F1,
The reduction ratio of F2, F7 milling train, revises the roll-force ratio of F3-F6 milling train so that the reduction ratio of F3-F6 milling train keeps the most steady
Fixed, it is to avoid the fluctuation of the mill load that entry temperature at finishing fluctuation causes also prevents that F7 mill load is excessive causes plate shape not
Good, hence it is evident that to decrease the generation of rolling accident, greatly improve the stability of rolling.(2) when solidifying in second control system
After the reduction ratio of F1, F2 milling train so that strip steel is end to end by after F1, F2 milling train, and the head of strip steel, aft plate shape keep the most steady
Fixed, be conducive to stablizing threading and throwing tail.(3) when the reduction ratio of solidification F7 milling train in second control system, by with reference to two grades
Model specification roll-force size so that the roll-force of the F7 milling train after solidification reduction ratio maintains 1000t-1300t, F7 milling train
Reduction ratio be maintained between 9%-15%.
The present invention improves the load distribution method of hot rolled thin strip rolling stability when rolling hot-rolling strip, rolls first piece
During thin gauge strip, it is allocated according to general load distribution method, at rolling second piece and the most same steel grade, same specification band
During steel, the reduction ratio of solidification F1, F2, F7 milling train, revise the roll-force ratio of F3-F6 milling train so that the reduction ratio of F3-F6 milling train
Keep relative stability, it is to avoid the fluctuation of mill load that entry temperature at finishing fluctuation causes also prevents F7 mill load excessive
Cause deformed steel strip, hence it is evident that decrease the generation of rolling accident, greatly improve the stability of rolling.
Embodiment described above is only to be described the preferred embodiment of the present invention, the not model to the present invention
Enclose and be defined, on the premise of designing spirit without departing from the present invention, the those of ordinary skill in the art technical side to the present invention
Various deformation that case is made and improvement, all should fall in the protection domain that claims of the present invention determines.
Claims (8)
1. the load distribution method improving hot rolled thin strip rolling stability, it is characterised in that comprise the steps:
When rolling hot-rolling strip, during first piece of thin gauge strip of rolling, it is allocated according to general load distribution method；
Rolling second piece and when the most same steel grade, same specification strip steel, the reduction ratio of solidification F1, F2 and F7 milling train, revise F3～
The roll-force ratio of F6 milling train so that the reduction ratio of F3～F6 milling train keeps relative stability.
The load distribution method of raising hot rolled thin strip rolling stability the most according to claim 1, it is characterised in that described
General load distribution method is as follows:
(1) first milling train F1 is in view of the fluctuation of made-up belt thickness, and difficulty, drafts may be caused should to be slightly less than maximum to nipping
Drafts,
(2) second rolling mill F2 and the 3rd rolling mill F3 give the biggest drafts, to make full use of capacity of equipment,
(3) the most each rolling mill F4～F7 is gradually reduced drafts, and the drafts of the last rolling mill F7 controls 10～15%,
To ensure plate shape, thickness and precision and performance quality.
The load distribution method of raising hot rolled thin strip rolling stability the most according to claim 2, it is characterised in that: described
The reduction ratio sum of F1, F2 milling train accounts for more than the 60% of finish rolling region total reduction, when the reduction ratio of F1, F2 milling train is fixed,
Strip steel state end to end will be stablized relatively.
The load distribution method of raising hot rolled thin strip rolling stability the most according to claim 3, it is characterised in that: for
Identical steel grade and the strip steel of specification, revise the roll-force ratio of described F3-F6 milling train, makes the reduction ratio rate of change of F3-F6 milling train
Within being maintained at 5%.
The load distribution method of raising hot rolled thin strip rolling stability the most according to claim 4, it is characterised in that: described
Thickness≤2.0 of strip steel.
The load distribution method of raising hot rolled thin strip rolling stability the most according to claim 5, it is characterised in that: rolling
Making second piece and when the most same steel grade, same specification strip steel, solidify the reduction ratio of described F1 milling train, the reduction ratio of described F1 milling train is protected
Hold between 46～52%.
The load distribution method of raising hot rolled thin strip rolling stability the most according to claim 6, it is characterised in that: rolling
Making second piece and when the most same steel grade, same specification strip steel, solidify the reduction ratio of described F2 milling train, the reduction ratio of described F2 milling train is protected
Hold between 48～53.5%.
The load distribution method of raising hot rolled thin strip rolling stability the most according to claim 7, it is characterised in that: rolling
Making second piece and when the most same steel grade, same specification strip steel, solidify the reduction ratio of described F7 milling train, the reduction ratio of described F7 milling train is protected
Hold between 10～15% so that the roll-force of the F7 milling train after solidification reduction ratio maintains 1000t～1300t.
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| CN201610729966.8A CN106311762B (en) | 2016-08-26 | 2016-08-26 | Improve the load distribution method of hot rolled thin strip rolling stability |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107716560A (en) * | 2017-10-16 | 2018-02-23 | 北京金自天正智能控制股份有限公司 | A kind of new Hot Strip Rolling load distribution method |
| CN108856305A (en) * | 2018-06-14 | 2018-11-23 | 武汉钢铁有限公司 | A kind of non-orientation silicon steel production mill load distribution method |
| CN114309085A (en) * | 2021-12-30 | 2022-04-12 | 本钢板材股份有限公司 | Production process for optimizing high-strength steel finish rolling reduction rate distribution |
| CN114433626A (en) * | 2022-01-21 | 2022-05-06 | 安阳钢铁股份有限公司 | Method for improving threading stability of hot continuous rolling thin-specification strip steel |
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| CN114433626B (en) * | 2022-01-21 | 2024-03-26 | 安阳钢铁股份有限公司 | Method for improving threading stability of hot continuous rolling thin strip steel |
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| CN106311762B (en) | 2018-06-26 |
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